Besides processing times and fee calculation, the USCIS also enables you to follow your case online. The case status tool requires your 13-character Receipt Number and provides you the same info you will receive from a representative of the federal agency.
As mentioned before, the processing times are the duration for completing most cases. In case you feel that it’s taking the federal agency longer to process your case, you should submit a request for information. Check the inquiry date given on the processing page. Ask about the case if the Receipt Date on your receipt is an earlier one than the inquiry date. The USCIS has a separate section for e-requests and inquiries.